Jawabanmu

2014-08-14T08:16:48+07:00
(5x - 6y + 8z) + (7x - 9z) - (2y +9z - 10) disederhanakan = 12x - 8y + 10 - 10z
2014-08-14T08:47:04+07:00
(5x-6y+8z) + (7x-9z) - (2y+9z-10)=?
cat: kelompokan variabel yg sama kemudian jumlahkan/kurangkan
(5x-6y+8z) + (7x-9z) - (2y+9z-10)=?
= 5x+7x-6y-2y+8z-9z-9z+10
=12x-8y-10z+10

semoga membantu :)